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500300 Rev. U

SCSI Configuration

5-1

SCSI Configuration

5.1

SCSI Configuration Menu

Qualstar SCSI-2 drives have an additional menu called the SCSI Configuration
menu that allows you to define the parameters shown in Table 5-1. A detailed
description follows the table.

LCD DISPLAY

(PARAMETER)

SELECTABLE VALUES

(DEFAULT VALUES)

COMMENTS

SCSI ID:

0 - 7 (5)

SCSI Device ID selection

SCSI LUN:

(0) - 7, ALL

Sets LUN to which drive will respond

SCSI PARITY:

(OFF), ON

SCSI bus parity detection

SCSI SYNC:

OFF, (ON)

Allow synchronous data transfers

SPACE:

(NORMAL), READ AHEAD

Read/Write mode switching

UNLOAD:

(NORMAL), INHIBIT, REWIND

Sets response to Unload command

WRITE CER:

(ERROR), LAST, NO, RETRY, YES

Reported status of last write retry

WRITE EOT:

(WRITE), RETAIN

Write buffer contents when EOT sensed

WRITE HER:

(REPORT), IGNORE

Ignore hard write errors

WRITE RETRYS:

(13) 0 - 99

Max # retries on write HER or CER

800 MASK WP:

(YES), NO

Mask write protect indication on 800 CPI

BLOCK LENGTH:

0 - 99 (2)

Sets fixed block length to displayed value x
256

BUFFER:

FORCE ON, FORCE OFF,
(NORMAL)

1 Megabyte buffer enable

BUSY:

(NOT READY), BUSY

See Section

DISCON:

(YES), NO DATA1, NO DATA2, NO

Allow disconnection during commands

EARLY EOT:

(NORMAL), EOM, 1 BLK

Buffering mode after Early EOT

EOM ON READ:

YES, (NO)

Report EOM reads past EOT marker

INQUIRY:

(QUALSTAR), various, see text

Selects Inquiry Data File

LNG BLK:

(STOP), CONTINUE

Read ahead termination for long blocks

MODEL:

3402/4, 3410/2, 3413/4, 3416/8

Drive model number (no default)

NRZI:

LRC/CRC, (NO LRC/CRC)

NRZI check character disable

RD BAD DATA:

(YES), NO

Returns bad data to host

RD EOT STOP:

YES, (NO)

Disable read beyond EOT tab

READ AHEAD:

OFF, 1 FMK, (2 FMK), 3 FMK

Read ahead enable/termination

READ CER:

(IGNORE), REPORT

Inhibit reporting of correctable read errors

READ HER:

(REPORT), IGNORE

Ignore hard read errors

READ RETRYS:

(10) 0 - 99

Max # retries on read HER

RESIDUE:

INVERT, (NORMAL)

Residue count format

REWRITE CER:

(YES), NO

Enable retries for correctable errors

Table 5-1 SCI Configuration Menu

Содержание 34XX Series

Страница 1: ...The Tape Experts 34XX User s Guide 500300 Rev U...

Страница 2: ...he information contained in this document current and accurate as of the date of publication or revision However no guarantee is given or implied that the document is error free or that it is accurate...

Страница 3: ...TIONS FOUND IN A WARNING PARAGRAPH ACHTUNG ES K NNEN PERSONENVERLETZUNGEN AUFTRETEN WENN SIE DIE UMGANGS BEDIENUNGS ODER WARTUNGSANWEISUNGEN NICHT VOLLST NDIG BEFOLGEN DIE IM ACHTUNGENPARAGRAPHEN BESC...

Страница 4: ...odels of the 3400 Series tape transport Pat No 4 893 312 Pat No 5 014 141 Bescheinigung des Herstellers Importeurs Hiermit wird bescheinigt da Qualstar Bandger te Modelle 3402S 3402SD 3404S und 3404SD...

Страница 5: ...om Qualstar please do the following Treat the merchandise carefully to assure its suitability for return Retain all shipping and packing materials Returned merchandise must be shipped to Qualstar in t...

Страница 6: ...tion 1 12 2 Controls and Indicators 2 1 2 1 Front Control Panels 2 1 2 1 1 Power Switch 2 1 2 1 2 Push button Switches 2 1 2 2 Front Panel Indicators 2 2 2 3 Liquid Crystal Display 2 3 2 3 1 Display L...

Страница 7: ...Configuration Menu Parameters 4 5 4 4 Manual Threading Function 4 12 4 5 Maintenance Menu 4 12 4 5 1 Using the Maintenance Menu 4 14 4 5 2 Default Configuration Function 4 14 4 5 3 Default SCSI Config...

Страница 8: ...HER Default Report 5 12 5 1 27 Read Retrys 5 12 5 1 28 Residue Default Normal 5 13 5 1 29 Rewrite CER Default Yes 5 13 5 2 Special Drive Configuration Menu Requirements for SCSI Drives 5 14 5 2 1 LOL...

Страница 9: ...1 7 2 1 Non Terminal Errors 7 1 7 2 2 Terminal Errors 7 1 7 2 3 Miscellaneous Messages 7 3 7 2 4 SCSI Error Messages 7 3 8 AC Power Configuration 8 1 8 1 Tools Required to Change AC Power Configuratio...

Страница 10: ...odels the installation and operation of the different models is basically the same Differences among models are noted where required from an operator s point of view all models function similarly 1 3...

Страница 11: ...Identification CAUTION To insure adequate airflow through the drive the fan at the rear of the drive must not be blocked 1 4 Unpacking the Tape Drive CAUTION The tape drive weighs about 60 pounds and...

Страница 12: ...pter 8 to change the selected voltage Figure 1 3 Location of Voltage Label WARNING IF THE LINE VOLTAGE DIFFERS FROM THAT SPECIFIED ON THE VOLTAGE LABEL DO NOT APPLY POWER THE POWER TRANSFORMER SELECTO...

Страница 13: ...ble 1 7 SCSI 2 Interface If your tape drive model number contains an S or SD you have a SCSI Small Computer Systems Interface tape drive and should read this section for important information regardin...

Страница 14: ...RN3 SCSI CTLR POWER CONNECTOR PCBA 500567 PCB500566 01 3 REV B WREX CONNECTOR J72 Figure 1 4 SCSI Single Ended PCBA Layout 500567 PCBA CAUTION The single ended and differential interfaces are electri...

Страница 15: ...f SCSI ID assignments An external terminator may be installed here in place of the internal terminator Multiple SCSI Cables Figure 1 6 SCSI Cable Configurations SCSI devices are usually some type of c...

Страница 16: ...six meters single ended configuration or 25 meters differential configuration as measured from one end to the other In most systems the host computer itself is one of the SCSI devices This is usually...

Страница 17: ...It can be identified by its two rows of pin receptacles and by the built in locking tabs at each end Plug the cable connector into either drive connector and secure it with the two locking tabs as sho...

Страница 18: ...2 and RN3 if using the differential version must be installed The terminators must be removed from all other devices on the SCSI bus except the device that is physically connected to the other end of...

Страница 19: ...ctor is connected in series with VTERM between the board s termination voltage and the termination voltage line on the SCSI bus If the current through the circuit protector is excessive the protector...

Страница 20: ...re three removable cable entry covers attached to the rear chassis panel with two Phillips screws each a When using a round interface cable remove all cable entry covers pass the cable through the upp...

Страница 21: ...ty stop allowing the drive to be accessed for servicing without removing it from the rack Each inner rail has a safety lever that must be actuated before the inner rail can be completely extended and...

Страница 22: ...and evenly 8 Lift both safety latches up slide the tape drive fully into the cabinet and tighten the screws that hold the rails to the rear of the rack 9 Extend the drive out about a foot and tighten...

Страница 23: ...1 14 Tape Drive Installation 500300 Rev U Right Cabinet Mounting Rail Inside upper Right Corner of Drive Bezel Right Cabinet Mounting Rail Standoffs Figure 1 13 Location of Rack Latch...

Страница 24: ...ormal operating mode are described in the following sections 2 1 2 1 LOAD Switch This switch has five functions in the operating mode Loads the tape if it is not already loaded Rewinds the tape if it...

Страница 25: ...ensity from 800 1600 3200 6250 6250s and back When the tape is beyond BOT the DENSITY switch is disabled The beginning of display line one shows the density you selected NOTE A small letter S followin...

Страница 26: ...ests It is available to you only when the drive is offline or in the standby state The operating mode is the normal mode i e offline online or standby 2 3 Liquid Crystal Display The drive displays sta...

Страница 27: ...wo Write from BOT density Read from BOT density Operating density Drive Address blank if SCSI Drive Status Reel Diameter Detected density Tape Indicator Online E EOT indicates Early End Of Tape 90 fee...

Страница 28: ...ne and ready to accept host commands It displays the amount of tape on the take up reel as a percentage of the total amount of tape on the supply reel regardless of the supply reel size The tape indic...

Страница 29: ...es when the drive is placed online When the tape moves forward from BOT display line two becomes a message line and its density indicators will be erased 2 3 2 2 Messages The message line is used to d...

Страница 30: ...Figure 3 1 Power Switch Location 2 Observe the label on the rear panel to verify the drive is already configured for the available AC voltage It the available voltage differs refer to Chapter 8 of th...

Страница 31: ...ects a problem during one of the tests it will present an appropriate message on display line two Press any switch to continue with the next test e When the last test is complete display line one will...

Страница 32: ...st 12 9 Write DSP Communications Test Check communications link between WREX and Write microprocessor 13 10 Verify Write DSP Checksums Check Write DSP sanity 14 11 Write D A Converter Test Check write...

Страница 33: ...damage to the edges of the tape can result When inserting and removing a reel of tape through the door rest the reel on the palm of your hand with your thumb on the bottom flange as shown in Figure 3...

Страница 34: ...ing the load sequence the ONLINE PENDing status can be toggled by pressing the ONLINE switch 2 Display line two will indicate various progress points during the load sequence such as CHECKING REEL THR...

Страница 35: ...isplay a LOAD FAULT error message Press any switch to clear the error message To restart the load sequence close the door and press LOAD 3 4 Rewinding and Unloading the Tape 3 4 1 Tape Not at BOT If t...

Страница 36: ...e event something happens which prevents the drive from automatically unlocking the supply hub you can manually unlock it as follows 1 Open the door and locate the red tipped lever at the front of the...

Страница 37: ...es the operation of ADS 3 6 1 Density Definitions To understand ADS you should first be familiar with certain terms and definitions 3 6 1 1 Initial Density The term initial density refers to the value...

Страница 38: ...s loaded which has no ID burst the drive displays an asterisk and uses the value stored in the NO ID DEN parameter as the detected density 3 6 1 5 Operating Density After a tape has left BOT the displ...

Страница 39: ...u Five modes are provided Manual disables ADS Load Read Dual and Initial The Load Read Dual and Initial modes determine how ADS selects the operating density as explained in the following paragraphs R...

Страница 40: ...sequence and changes the read density to match it The write density will remain unchanged If the drive has just been powered up the write density assumes the value of the INITIAL DEN parameter The dri...

Страница 41: ...revents the tape from coming off of the supply reel in case of a host computer malfunction This feature is controlled by the EOT STOP parameter in the Drive Configuration menu and is fully described i...

Страница 42: ...urs Should the power be interrupted while the tape is moving the drive will bring the tape to a controlled stop before dropping tape tension No physical damage will result to the tape To recover resto...

Страница 43: ...host to request further user input 3 8 Aborting Online Operations from the Front Panel You may interrupt most online operations while the drive is busy by pressing the ONLINE switch If the Command Dis...

Страница 44: ...rating Instructions 3 15 VARIABLE LENGTH ERASE The drive will terminate the erase operation and go offline Normally the host determines the erase length The drive will resume normal operation when pla...

Страница 45: ...U PREPARE MEDIA SUB MENU DRIVE CONFIGURATION MENU SCSI CONFIGURATION MENU MANUAL THREAD FUNCTION MAINTENANCE MENU C E TEST MENU Figure 4 1 34XX Menu Hierarchy 4 1 1 Menu Hierarchy The menu system cons...

Страница 46: ...STEP DISPLAY DRIVE STATUS Apply power STANDBY Drive awaits user input Press the Menu switch once RESET HEAD CLEAN Drive enters Menu mode and displays first function Press the UP switch once DRIVE CON...

Страница 47: ...nfiguration menu the factory default is 25 3 Press MENU twice The display returns to its original indication 4 3 Drive Configuration Menu NOTE Moving W1 on the Write Executive PCBA from ON to OFF allo...

Страница 48: ...NORMAL LONG EX LONG Extended write gap selection WRT PARITY EXT INT Internal or External write parity generation DENSITY MANUAL LOAD READ DUAL INITIAL Sets the density mode of operation NO ID DEN BLA...

Страница 49: ...raphs explain the options and configurations that are accessible via the Drive Configuration menu Some of these parameters must be set to particular values on SCSI drives as described in Section 5 1 A...

Страница 50: ...tape If this feature is enabled and the tape travels thirteen feet past the EOT marker during a forward read space or search operation the tape drive will terminate the operation immediately stop the...

Страница 51: ...isplays RO in display line two NO The write and erase circuitry are enabled 4 3 2 10 FMK GAPS Default Normal This option selects one of two possible values for the file mark gap length NORMAL Selects...

Страница 52: ...ables density selection via the interface command bus if the drive is ready online and at BOT Also referred to as Remote Density Select NO The tape drive ignores Density Select commands and generates...

Страница 53: ...he tape drive to do so However some controllers do generate write parity and send it to the drive on the IWP interface line This option allows the tape drive to be compatible with both versions INT Th...

Страница 54: ...made when the SEISMIC option is set to ON 1 Dynamic Character Gate Timing is enabled 2 CRC and LRC error reporting is disabled 3 Read thresholds are set to higher levels All three of these alternative...

Страница 55: ...es the reporting of Hard Errors HERs caused by the CRCC and LRCC characters found at the end of each NRZI data block The SEISMIC configuration option has two possible values NO and YES Note that this...

Страница 56: ...ORMAL Locks tape speed during GCR operations to 125 IPS SLOW Locks tape speed during GCR operations to 62 5 IPS BOTH Allows you to select GCR tape speed via the DENSITY switch when the tape is at BOT...

Страница 57: ...um in hexadecimal SCSI VERSION SCSI CPU firmware version and revision date SCSI CHECKSUM SCSI CPU PROM checksum in hexadecimal PREPARE MEDIA WRITE 6250 IDENT Initializes tape with 6250 ID burst 341X o...

Страница 58: ...display line two will indicate ENTER TO RESET If you press ENTER again display line two will indicate BUSY and the drive will reset all Drive Configuration parameters to their factory defaults Upon co...

Страница 59: ...e Prepare Media sub menu functions will erase part or all of the tape and should be used with discretion The following steps are used to execute a Prepare Media function 1 Load a tape 2 Step through t...

Страница 60: ...ll nine read channels and when one or more channels fall below the normal threshold a dropout is counted Single channel and multiple channel dropouts are counted separately Multiple channel dropouts i...

Страница 61: ...Display Command Log AC Line Voltage SCSI Diagnostics 4 5 8 1 General Tests The GENERAL TESTS are the same nineteen tests sixteen for models 340X that are performed each time the drive is powered up th...

Страница 62: ...ntered during writing If the test fails it should be repeated once using a different tape To run the test perform the following steps 1 Load any size reel 2 Use the front panel switches to enter the D...

Страница 63: ...indicates MOTION TEST 3 Press ENTER The BUSY indicator illuminates display line two indicates BUSY and the test begins a If the test completes successfully display line two will indicate PASSED Press...

Страница 64: ...he test is begun To check the sensors manually perform the following steps when display line one indicates DIAGNOSTICS 1 Press ENTER Display line one indicates GENERAL TESTS 2 Press three times Displa...

Страница 65: ...sequence from 00 to 47 00 is most recent If present S indicates tape streamed for that command ZZ Hex Command code Command name Figure 4 3 Command Log Display 4 5 8 6 AC Line Voltage Function The AC...

Страница 66: ...in the technical service manual 4 5 9 2 PROM Change Function During the General Tests which are also performed each time the drive is switched on the checksums of all EPROMs in the drive are read and...

Страница 67: ...ed checksum for the WREX EPROM and should match the checksum written on the EPROM label recorded before installation f In the same manner the checksums of the Write DSP Read DSP 341X only Motion CPU a...

Страница 68: ...ly hub Checks the temperature sensor and the 70 volt power supply Checks and calibrates the BOT EOT sensors Determines the offsets of the motor driver circuits used in motor control Determines the bac...

Страница 69: ...e tape and if successful will display CALIBRATION COMPLETED a If the function completed successfully the calibration information will be stored in non volatile memory b If an error is detected an appr...

Страница 70: ...WP YES NO Mask write protect indication on 800 CPI BLOCK LENGTH 0 99 2 Sets fixed block length to displayed value x 256 BUFFER FORCE ON FORCE OFF NORMAL 1 Megabyte buffer enable BUSY NOT READY BUSY S...

Страница 71: ...s parameter must be set to 0 for SCSI operation See also Section 4 3 2 11 5 1 3 SCSI Parity Default Off This parameter refers to the parity on the SCSI bus and not the parity recorded on the tape NOTE...

Страница 72: ...tape motion will occur REWIND The tape drive will rewind the tape but will not unload it 5 1 7 Write CER Default Error This parameter determines what the drive will report after the final write retry...

Страница 73: ...ons are enabled and the EOT marker is sensed while writing WRITE All unrecorded data in the buffer will be written to tape and the drive will then report an End Of Medium Check Condition with the Info...

Страница 74: ...EXIT until the MENU indicator goes out Regardless of the value of this parameter errors that occur while writing blocks larger than one megabyte will not result in retries 5 1 11 800 Mask WP This para...

Страница 75: ...drive sets the Check Condition bit in the Completion Status byte and a sense key of Not Ready Busy The tape drive sets the Busy bit in the Completion Status byte 5 1 15 Discon Default YES The Disconn...

Страница 76: ...the host upon detecting Early EOT and will leave the buffer size at 1 megabyte It will accept further Write commands and will keep the tape streaming It will NOT however report EOM when the EOT marke...

Страница 77: ...1 Qualstar 340XSD 018002021F000010 QUALSTAR 3402 4SD 1 36 1 Qualstar 341X 018002021F000010 QUALSTAR _3410 2 1 36 STK 018002021F000010 STK 4280 1 36 Telex 018001001F000000 TELEX 2440 MODEL A10 1 36 NOT...

Страница 78: ...358 SCSI Supplement 34XX Series Custom Bytes 0 7 These eight bytes of hexadecimal data are bytes 0 through 7 of the Inquiry data file Edit these bytes with care to maintain compatibility with SCSI sys...

Страница 79: ...drive can read it in i e the buffer overflows Long blocks are usually encountered in audio or seismic applications and can be many megabytes long This option controls the operation of a read ahead ope...

Страница 80: ...ault Yes This parameter determines whether or not the drive will transfer data to the initiator when that data contains an error YES The drive will transfer data that contains an error and will report...

Страница 81: ...ommand and ends either when the buffer is full or when two sequential filemarks are read The read ahead operation will resume when a Read Read Reverse or Space command is processed after the two seque...

Страница 82: ...sult in retries 5 1 28 Residue Default Normal The Residue parameter refers to the contents of the Information Bytes that are returned to the initiator in response to the REQUEST SENSE command These by...

Страница 83: ...ation menu that affect SCSI operation Unlisted parameters are transparent to SCSI operation and may be set as desired 5 2 1 LOL Enable The LOL Enable parameter must be set to YES if the drive is to re...

Страница 84: ...ics it will display one of the error messages in Table 5 4 ERROR DISPLAY DEFINITION DMA CHIP FAILURE The DMA device on the SCSI PCBA has failed SCSI CHIP FAILED The SCSI Controller device on the SCSI...

Страница 85: ...uces the magnetic saturation of the flux reversals on the tape A similar buildup on the read head gaps can cause a reduction in the induced signal from the tape In severe cases the buildup can actuall...

Страница 86: ...e handled properly If you operate your tape drive in a dusty environment or use dirty old or mishandled tapes you must clean the tape path more often and the interval at which the reminder appears sho...

Страница 87: ...Preventative Maintenance 6 3 Figure 6 1 Tape Path Components That Must Be Cleaned Figure 6 2 Cleaning the Read Write Head Figure 6 3 Cleaning the Tape Guides 3 Clean the tape cleaner blade as shown i...

Страница 88: ...agnetically equivalent to the ANSI standard 1 5 mil tape Because of the thinner material 1 mil tape conforms differently to the read write heads As a result the critical read write surface of the head...

Страница 89: ...nfigured for a variety of options The drive communicates with the system via the industry standard formatter interface Tape controllers that adapt this interface to nearly any modern mini micro or per...

Страница 90: ...han at 1600 CPI 3 IBG Length Data is not normally written in one continuous stream but in a series of individual blocks each separated by an IBG The length of the IBG is 0 6 inch in the NRZI PE and DP...

Страница 91: ...048 bytes the maximum size specified by ANSI Length ft 300 600 1200 2400 3600 Density MEGABYTES 1600 CPI 5 8 11 5 23 1 46 1 69 2 3200 CPI 11 5 23 0 46 1 92 2 138 4 6250 CPI 22 5 45 0 90 0 180 0 270 0...

Страница 92: ...00 Rev U 1024 3 8 7 6 15 3 30 5 45 8 2048 5 7 11 5 22 9 45 0 68 8 4096 7 7 15 3 30 6 61 2 91 9 8192 9 2 18 4 36 8 73 6 110 4 16384 10 2 20 5 40 9 81 8 122 8 32768 10 8 21 7 43 3 86 7 130 0 Table 6 3 F...

Страница 93: ...0 128 1 0 2 1 4 2 8 4 12 6 256 1 9 3 9 8 0 16 0 24 0 512 3 6 7 2 14 7 29 4 44 2 1024 6 2 12 4 25 3 50 6 75 9 2048 10 1 20 2 39 5 79 0 118 5 4096 13 9 27 9 54 9 109 8 164 7 8192 17 2 34 5 68 2 136 4 2...

Страница 94: ...s are the detection of blank tape the opening of the front door while tape is in motion or a low regulator output Non terminal errors cause a message to appear on the second line of the front panel di...

Страница 95: ...FAULT XXX where XXX is the error code number in display line one and will halt the operation Additional information may be present in display line two The unload operation will be aborted when the fa...

Страница 96: ...PEN The front door or top cover was opened while the tape was in motion EXEC CHKSUM ERR A checksum error occurred in the WREX microcomputer during power up or manual diagnostics FILE PROTECT ERR A wri...

Страница 97: ...ead reverse command was received while the tape was positioned at BOT READ THRESH FAIL An out of tolerance condition was detected in the read threshold circuitry during power up or manual diagnostics...

Страница 98: ...are described in paragraph 7 2 2 1 MOTION FAULT XXX CMD XX STATUS XX An error associated with tape motion has occurred Motion faults are described in paragraph 7 2 2 3 OVER TEMPERATURE Drive internal...

Страница 99: ...acted position LOAD FAULT 36 CAL DATA CORRUPT Motion PCBA detected invalid calibration data LOAD FAULT 19 TAPE STUCK Can t pull tape out of TIP1 sensor or TIP1 sensor failure LOAD FAULT 37 59 Not used...

Страница 100: ...500300 Rev U Errors and Operational Failures 7 7 Table 7 5 Load Errors...

Страница 101: ...stop turning UNLOAD FAULT 51 REEL DRAGGING No File Protect Reel In Place signal Possible FPT sensor failure UNLOAD FAULT 52 No File Protect Reel In Place signal Possible FPT sensor failure UNLOAD FAUL...

Страница 102: ...out occurred while ramping the tape up to speed 52 A time out occurred while ramping the tape down to a stop 53 The tape speed is too slow 54 The tape speed is too fast 55 The tape tension is too low...

Страница 103: ...failure 90 1 2 second notice of impending over temperature shutdown 100 Processor failure on the Motion board Table 7 8 Motion Faults Part 2 ERROR DISPLAY MEANING POSITN FAULT 1 The tape position was...

Страница 104: ...light near the EOT BOT sensor Repeat the test with the top cover closed If the error persists the EOT BOT sensor may be defective BOT SENSOR WON T CALIBRATE Faulty BOT EOT sensor or associated wiring...

Страница 105: ...ER IS REMOVED DISCONNECT THE AC LINE CORD BEFORE REMOVING THE REAR COVER GEFAHR DIE IN DIESEM KAPITEL BESCHRIEBENEN VERFAHRENSWEISEN BESITZEN EINE POTENTIELLE SCHOCKGEFAHR UND SOLLTEN DESHALB NUR VON...

Страница 106: ...re 8 1 for details 5 Measure the AC line voltage at the receptacle The tape drive will accommodate an AC line voltage between 10 and 15 of the switch setting Use Table 8 1 to determine the correct swi...

Страница 107: ...correct and that the power switch is turned off LINE VOLTAGE CAUTION REMOVE POWER BEFORE CHANGING SWITCHES SEE USER S MANUAL FOR INSTRUCTIONS Switches shown Set for 120 VAC 100V 220V Rear of Drive T...

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